Explicitly setting newline character for Project Settings

This allows projects created on one OS to be used on another
and doesn't show ProjectSettings in list of files that changed.

Bug: 161486044
Fixes #386

Change-Id: I7a3a196c85348b0d56488501b48a05ec529b30d7

Author: vimanyu

source/VersionHandlerImpl/src/ProjectSettings.cs

@@ -817,9 +817,14 @@ private static void Save() {
                     return;
                 }
                 try {
-                    using (var writer = new XmlTextWriter(new StreamWriter(PROJECT_SETTINGS_FILE)) {
-                            Formatting = Formatting.Indented,
-                        }) {
+                    using (var writer =
+                           XmlWriter.Create(PROJECT_SETTINGS_FILE,
+                                            new XmlWriterSettings {
+                                                Indent = true,
+                                                IndentChars = "  ",
+                                                NewLineChars = "\n",
+                                                NewLineHandling = NewLineHandling.Replace
+                                            })) {
                         writer.WriteStartElement("projectSettings");
                         foreach (var key in projectSettings.Keys) {
                             var value = projectSettings.GetString(key);